<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        let arr = []
        let index = -1
        for (let i = 0; i < 5; i++) {
            let num = +prompt(`请输入第${i + 1}个数字`)
            arr.push(num)
            if (num % 10 === 0) {
                console.log(`10的下标为：${i}`)
                index = i
            }
        }
    </script>
</body>

</html>